Should a girl wash her hair in the shower twice?

Depending on the level of dirty your hair is. If you have normal to oily hair, especially longer thicker hair than yes. I work at a salon and for those with particularly dirty or just thick long hair we do shampoo twice. If you are unsure shampoo once with a regular amount and see how sudsy your soap gets. If there is little suds you should work it in rinse and then shampoo again, notice the bubles? The cleaner the hair the more suds you will get